Add option to use yarn instead of npm for ArtifactoryNpm tasks

[danmastrowcoles]

Is your feature request related to a problem? Please describe.
At the moment we are using yarn for a node based repo, however this means when using a the azure devops extension, and using the [email protected] task, it will use npm. This creates an issue where we do not have a package-lock.json, but do have a yarn.lock file.

Describe the solution you'd like to see
A clear and concise description of the new feature.
Option to use yarn instead of npm for all the artifactorynpm tasks

Describe alternatives you've considered
Can do a manual npm login to Artifactory and yarn install, but then thats not using this devops extension

[tscheffert]

👍 For this. We use Artifactory + Azure DevOps + Yarn as well. I would like to use the extension to collect all of the build meta data if possible, but we can't do that and use yarn at the moment.

[fourpastmidnight]

I, too, have a Node+React app using yarn. This would be a very welcome addition.